K. Ebisike, O.O. Ayejuyo, J.A. Sonibare, O.A. Ogunkunle and T.V. Ojumu
Journal of Applied Sciences 4 ( 4 ): 623 - 629 , 2004
F.A. Akeredolu, A.J. Isafiade and J.A. Sonibare
Journal of Applied Sciences 5 ( 3 ): 532 - 539 , 2005